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Method of Manufacturing a Perpendicular Magnetic Disc

a perpendicular magnetic disk and manufacturing method technology, applied in the field of perpendicular magnetic disk manufacturing, can solve the problems of low coating strength, low coating strength, and invite a decrease in the reliability of the perpendicular magnetic disk, and achieve the effect of improving reliability and high snr

Inactive Publication Date: 2012-08-16
WD MEDIA SINGAPORE PTE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024]According to the present invention, a method of manufacturing a perpendicular magnetic disk capable of improving reliability while ensuring a high SNR can be provided.

Problems solved by technology

However, the presence of fine holes means a rough state of the coat.
Therefore, the high-pressure Ru layer has a low coating strength and tends to have a damage or loss occur due to a contact with a magnetic head, and therefore is a cause of inviting a decrease in reliability of the perpendicular magnetic disk.
However, when the high-pressure Ru layer is made thinner, microfabrication and isolation of the crystal particles of Ru do not reach a desired degree, and the effect to be given to the magnetic particles of the granular magnetic layer is decreased.

Method used

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  • Method of Manufacturing a Perpendicular Magnetic Disc
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  • Method of Manufacturing a Perpendicular Magnetic Disc

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examples

[0055]To confirm effectiveness of the above-structured perpendicular magnetic disk 100 manufactured by using the manufacturing method described above, description is made by using samples as examples below. FIG. 2 is a drawing for comparing and describing various components as being changed. Here, it can be said that reliability of the perpendicular magnetic disk 100 means durability thereof, in other words. Therefore, in reliability tests shown in FIG. 2, scratch tests by a needle, which are durability evaluation tests, were adopted, and evaluations were made in four steps, with “AA” when an abrasion mark in the scratch tests has a depth smaller than 0.5 nm, “A” when the depth is equal to or larger than 0.5 nm and smaller than 1.0 nm, “B” when the depth is equal to or larger than 1.0 nm and smaller than 3.0 nm, and “C” when the depth is equal to or larger than 3.0 nm.

[0056]As an example, on the base 110, by using a vacuumed film forming device, films of the adhesion layer 120 to th...

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Abstract

A method of manufacturing a perpendicular magnetic disk comprises forming, on a base, a film of a first ground layer made of Ru or a Ru alloy at a first pressure, forming, on the first ground layer, a film of a second ground layer made of Ru or a Ru alloy at a second pressure higher than a first pressure, forming, on the second ground layer, a film of a third ground layer having Ru or a Ru alloy as a main component and an oxide as an accessory component at a third pressure higher than the first pressure and lower than the second pressure, and forming, on a layer above the third ground layer, a film of a granular magnetic layer in which a non-magnetic substance having an oxide is segregated around magnetic particles having an CoCrPt alloy grown in a columnar shape to form a grain boundary.

Description

TECHNICAL FIELD[0001]The present invention relates to a method of manufacturing a perpendicular magnetic disk implemented on an HDD (hard disk drive) of a perpendicular magnetic recording type or the like.BACKGROUND ART[0002]With an increase in capacity of information processing in recent years, various information recording technologies have been developed. In particular, the surface recording density of an HDD using magnetic recording technology is continuously increasing at an annual rate of approximately 50%. In recent years, an information recording capacity exceeding 320 gigabytes per platter has been desired for a magnetic recording medium with a 2.5-inch diameter for use in an HDD or the like. To fulfill such demands, an information recording density exceeding 500 gigabits per square inch is desired to be achieved.[0003]Important factors for increasing recording density of the perpendicular magnetic disk include, for example, an improvement in TPI (Tracks per Inch) by narrow...

Claims

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Application Information

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IPC IPC(8): B05D3/00
CPCG11B5/65G11B5/8404G11B5/7325G11B5/7369G11B5/658
Inventor SAKAMOTO, KAZUAKIKAJIWARA, TAKENORI
Owner WD MEDIA SINGAPORE PTE
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